This is a power analysis on the CPUE sampling program for the Wampus Creek watershed. A summary of the number of locations sampled by year is found in Table 1.
| Year | Locations | BKTR | BLTR | BURB | MNWH | RNTR |
|---|---|---|---|---|---|---|
| 2000 | 1 | 0 | 0 | 0 | 0 | 308 |
| 2007 | 3 | 86 | 0 | 0 | 21 | 293 |
| 2009 | 2 | 40 | 0 | 3 | 0 | 131 |
| 2011 | 2 | 37 | 0 | 0 | 0 | 137 |
| 2013 | 2 | 30 | 1 | 1 | 0 | 84 |
| 2015 | 2 | 43 | 0 | 1 | 0 | 156 |
| 2016 | 2 | 21 | 1 | 0 | 2 | 80 |
A preliminary plot of the CPUE over time for each of the species is found in Figure 1. Notice that even if the total number of fish captured is very small, there may many locations with imputed catches of 0 fish and so the plot may have many more points than expected.
The variance components were estimated after fitting a linear mixed model to the CPUE on the logarithmic scale. A summary of the estimated variance components is found in Table 2.
| Species | Sampling SD | Process SD |
|---|---|---|
| BKTR | 0.04 | 0.24 |
| BLTR | 0.03 | 0.01 |
| BURB | 0.64 | 0 |
| MNWH | 0 | 0 |
| RNTR | 0.01 | 0.59 |
A power analysis was conducted to detect a 10%, 30%, 50%, 100%, 200%, 300% change over 5 years by varying the number of sites given the sampling and process error estimated above. Results are summarized in Figure 2 (one plot per species).
Add text here summarizing the bleak results